(Wilmington, DE-August 7, 2014) With three weeks left of summer, some ambitious Brandywine Treasure Trail Passport holders have just a few stamps left to fill on their Passports. They've explored Winterthur Museum, Garden and Library's Costumes of Downton Abbey exhibit, they've strolled Longwood Gardens' brand new meadow garden, and they've gotten up close and personal with Bugs: Outside the Box at Delaware Museum of Natural History.

They've had a summer romance with the Brandywine Treasure Trail and crave an autumn roll in the hay with their favorite attraction.

The Brandywine Museums & Gardens Alliance recommends the following post-Passport activities for adults:

• Take a Guided Garden Walk at Nemours Mansion and Gardens. Unlike the Passport experience, which encompasses the mansion and gardens-by-bus tour, Garden Walks cover many acres. Your garden guide will describe the sculptures, architecture and plantings you encounter on your tour. $10; ages 12 and older only. By reservation only through December; click here to make them online.

• Investigate your family tree at the Delaware Historical Society. Research your Delaware genealogy using the materials and tips offered by the Society's Research Library. Open four days a week and some Saturdays. Click here for information on how to get started.

• Take a tour of the N.C. Wyeth House and Studio, Andrew Wyeth Studio and Kuerner Farm during a visit to the Brandywine River Museum of Art. Immerse yourself in the environment that has inspired the Wyeth art dynasty for decades. Each of the three tours is $8 in addition to museum admission; no one under age six allowed on tours. Takes place seven days a week through late November. Click here for advance timed tickets.

• Unwind in The Delaware Contemporary's Art Lounge the second Wednesday of each month, September through December. From 5:00 to 7:00 p.m., enjoy a cash bar while perusing DCCA's new art sales gallery and trunk show. DCCA: A 35-Year History Retrospective Exhibition and Navigation Puzzle, Members' Group Exhibition are two of the exhibits that will be on view. Admission is free.

• Decide for yourself if ghosts are real by experiencing Rockwood Museum & Park's Ghost Tours. On select Saturday nights starting in September, experts offer four different levels of paranormal experiences, from indoor ghost hunting to outdoor exploration to an overnight adult investigation. Most programs are for ages 12 and older. Click here to make reservations.

• Face your Ophidiophobia by visiting the Delaware Museum of Natural History's Titanoboa: Monster Snake exhibit from September 27, 2014 through January 25, 2015. This Colombian fossil is the largest snake ever found at 48 feet (longer than a school bus). Organized by the Smithsonian Institution Traveling Exhibition Service in collaboration with the Smithsonian Tropical Research Institute, the Smithsonian Channel, and the Florida Museum of Natural History. Click here for information.

• Learn about gardening with native plants in a more sustainable way at Mt. Cuba Center. Fall courses include Ecological Gardening Certificate classes, a Mushroom Workshop and a field trip to Rushton Farms to experience bird banding and sustainable farm practices first hand. Click here for information.

• Take in an evening program at Hagley Museum and Library. Learn about American industry from authors and experts. On September 18, Janneken Smucker discusses Amish quilts on October 7, Zack King of Delaware Distilling Company leads an exploration of the distilling industry, and on November 20, Ben Waterhouse discusses the business of political lobbying. Varying times and prices. Click here for information.

• Join Winterthur Museum, Garden & Library's History through Fiction Book Club. On first Tuesdays, October through December from 10:00 a.m. to 12:00 p.m., take part in informal discussion of books that shed light on life and objects at Winterthur. Kate Morton's The House at Riverton will appeal to fans of the Costumes at Downton Abbey exhibit. $30; registration required by phone by September 22. Click here for information.